Best Practices for Your Fault Domains in vSAN Clusters VMware vSphere 6.5

Hello Guys !

I just picked a nice topic for this lazy Sunday night! As we have done some vSAN configurations previously, it just came up to my mind to have this topic today, so do we know what is fault domain in vSAN? It is very helpful protection way to keep vSAN cluster spans across multiple racks or blade server chassis.

My best practices notes for this subject;

  • In vSAN cluster, we must configure at least 3 Fault Domain and I’m sure best result will be having 4 or more fault domains configured.
  • If the host (ESXI) not part of any fault domain, it will be accepted as just one host it self.
  • You do not need to add each vSAN Host for one Fault Domain, but it is important that if you decide to protect vSAN environment in your virtual side, than infrastructure of Fault Domain needs to be on equal capacity.
  • When you move your vSAN host under another cluster, it is protecting it self as being part of same Fault Domain (Does not change anything and still being part of the same Fault Domain.)
  • When you planning / designing a Fault Domain , I strongly suggest to have same amount of host devices for each Fault Domain.·

I hope that gives you IDEA of having a Fault Domain.

If you have any question, please let me know!

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